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O.D. 219mm Concentric overburden casing with blocks for water well projcet

O.D. 219mm Concentric overburden casing with blocks for water well projcet

O.D. 219mm Concentric overburden casing with blocks for water well projcet

Product Details:

Place of Origin: Hunan, China (Mainland)
Brand Name: Teamwhole
Certification: ISO9001:2008
Model Number: Concentric casing system

Payment & Shipping Terms:

Minimum Order Quantity: 1 Set/Sets Concentric overburden drill bit
Price: Negotiation
Packaging Details: Concentric overburden drill bit are packed Inner package with cartons,outer package with wooden cases.
Delivery Time: Shipped in 25 days after payment
Payment Terms: L/C, T/T
Supply Ability: 5000 Set/Sets per Month Concentric overburden drill bit
Detailed Product Description
Place Of Origin: Hunan, China (Mainland) Brand Name: Teamwhole
Type: Concentric Casing System Model: T185
Casing Tube O.D.: 219mm Casing Tube I.D.: 199mm
Wall Thickness: 10mm Guide Device Max. Dia.: 197mm
Reamed Dia.: 234mm Max O.D. Of Normal Bit: 185mm
Hammer Type: COP64/ DHD360(TH6)/ SD6/ QL60/ M60 Weight: 61KG

219mm Concentric overburden drill bit with blocks




1.Face: Flat,Convex,Concave,Drop-center.
2.Carbide Button Shape: Spherical,Semi-ballistic,Ballistic and Two-step
3.Bit Shank: COP64/ DHD360(TH6)/ SD6/ QL60/ M60

Model Outer Dia.of casing tube Inner Dia.of casing tube Wall thickness of casing Reamed Dia(mm) Min.Inner Dia of Casing System Drill Pipes Hammer Type
(mm) (mm) (mm) (mm) (mm)
146 178 158 10 192 148 76/89 COP54/DHD350/QL50/SD5
165 194 173 10.5 205 161.5 89/114 DHD360/QL60/SD6
185 219 199 10 234 185 89/114 DHD360/DHD380/QL60/QL80/SD6/ SD8
240 273 253 10 305 241 114/127 DHD380/QL80/SD8
280 325 305 10 350 282 114/127 SD10/DHD112
365 406 382 12 425 412 127/168 DHD112
410 457 433 12 480 409 168
460 508 483 12.5 530 459 168
500 560 535 12.5 620 501 168


General Introduction


Application Range

It is recommended to drill in rock formation where contains some ovals and fractures.

Design Principles

Make the casing follow easy and the equipment and operation simple

Outstanding Advantages

1.The stable and reliable working performance and the less vibration of drill rig.

2.Flexible to open and close.

Operation Procedure

1.when the drilling starts, the blocks slides down through the grooves on pilot bit,and reams to drive the casing shoes and tubes into the hole.

2.When finished the drilling in overburden rock formations, raise the drilling tools and the blocks will get closed through the grooves , and the drilling tools can be pulled out from the hole.

3. Next construction can be followed.


Raw Material



first class special alloy steel with high strength, heat resistance and wearable

The best tungsten carbides from China are commonly applied.
Tungsten carbide from European is also available.



Contact Details
Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.

Contact Person: Ms.chen

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